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  <meta charset="UTF-8">
  <title>JavaScript 语法</title>
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<body>
<h2>JavaScript 运算符</h2>

<p>JavaScript 使用算数运算符来计算值（类似代数）。</p>

<p id="demo"></p>

<script>
  document.getElementById("demo").innerHTML = (7 + 8) * 10;
</script>

</body>
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